1. Department of Radiology, Medical College of Wisconsin, Milwaukee, Wisconsin.
2. Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin.
3. Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin.
4. Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin.
5. Department of Anesthesiology and Center for Consciousness Science, University of Michigan, Ann Arbor, Michigan.